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https://issues.apache.org/jira/browse/PDFBOX-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16782363#comment-16782363
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Tilman Hausherr commented on PDFBOX-4477:
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The user password is empty. It is the owner password that is not empty. You
need to ask that one to be able to extract the text. (Try with Adobe Reader,
you'll have the same problem, you won't be able to copy & paste text). But like
I said, you can still get the text with a java program, e.g. the ExtractText
source code with one line commented.
> Large encrypted file takes days to be parsed
> --------------------------------------------
>
> Key: PDFBOX-4477
> URL: https://issues.apache.org/jira/browse/PDFBOX-4477
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto, Parsing
> Affects Versions: 2.0.14
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Labels: optimization
> Fix For: 2.0.15, 3.0.0 PDFBox
>
>
> As reported by [~slavago] in TIKA-2832. File is confidential but I have it.
> Initial findings:
> - File is AES256 encrypted with empty user password
> - File has about 1000 objects
> - File is a tagged PDF
> - HashMap in SecurityHandler grows to 100000?!
> - Using an IdentityHashMap speeds up the process dramatically (parsed in a
> few seconds), and it may also be a better solution that what was done in
> PDFBOX-4453
> Todo:
> - Read description of IdentityHashMap again
> - Find out why the HashMap grows so much. Could it be that identical objects
> are stored twice? Or does the file have many direct objects?
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